Changes in Root IAA Content and Growth of Bareroot Conifers with Plant Growth Regulating Substances at Planting

Nursery Crops
An experiment was conducted to determine whether application of plant growth regulators (PGRs) or moisture retention materials could modify IAA concentrations in roots, new root growth, and above ground plant growth. Douglas-fir, Englemann spruce, western larch, and lodgepole pine species were used.

Ten-Year Growth and Survival of Douglas-fir Seedlings Treated with Plant Growth Regulating Substances at Transplant

Nursery Crops
A report on how the application of specific plant growth regulators (PGRs) and a moisture retention gel to the root systems of Douglas-fir can influence root indole-3-acetic acid (IAA) content, and tree growth and survival 10 years after planting in a clearcut.

Regulation Root Growth in Ericaceous Plant Propagation

Nursery Crops
USDA-ARS affiliated author discusses the relationship between rooting and tissue nitrogen and protein content of ericaceous plants. The information presented is based on investigations into hormonal and nutritional regulation of root growth during propagation of common ericaceous plants grown in Pacific Northwest nurseries.

Influence of Ectomycorrhizal Fungal Inoculation on Growth and Root IAA Concentrations of Transplanted Conifers

Nursery Crops
USDA-ARS affiliated researchers tested the hypothesis that: (1) IAA concentration of mycorrhizal conifer roots is influenced by the in vitro (IAA and ethylene) production capacity of their associated ectomycorrhizal fungi; and (2) increased concentrations of root IAA cause an increase in root growth resulting in improved seedling growth and survival.

A Systematic Approach to Diagnosing Plant Damage

Management
A comprehensive guide for determining the difference between nonliving and living causes of plant damage. The authors also provide a list of available references for identifing plant problems, references topics vary from general plant problem diagnosis to crop specific.

Root Culturing in Bareroot Nurseries

Nursery Crops
Information provided on the bareroot nursery practice of root culturing. Root culturing is defined by the author as a general term for nursery cultural practices designed to modify root growth or morphology while the seedling is still in the nursery bed.

Effects of Spring Soil Nitrogen Application on Nitrogen Remobilization, Uptake, and Partitioning for New Growth in Almond Nursery Plants

Fertilizer
A study was conducted on almond trees to (1) determine whether soil N application alters N remobilization; (2) quantify the effects of soil N availability in the spring on N uptake, distribution, and new growth; and (3) determine the most efficient time for spring soil N applications.

Soil and Foliar Nitrogen Supply Affects the Composition of Nitrogen and Carbohydrates in Young Almond Trees

Fertilizer
The objectives of this study were to determine the chemical composition of nitrogen (N) and non-structural carbohydrates in response to different N supplies and the interaction between storage N and non-structural carbohydrates in young almond trees.

N Uptake, Soil Retention and Loss of Soil-Applied 15NH4 15NO3 in Young Fuji/M.26 Apple Trees with Different N Status

Nursery Crops
The purpose of research conducted on young apple (Malus domestica Borkh) trees was to determine the fate of soil applied nitrogen to young apple trees and the influence of tree nitrogen status on nitrogen uptake by young apple trees.

Capillary Beds

Nursery Crops
A discussion about capillary beds and also a how to guide on the construction of the beds for nursery production. Topics addressed include the construction of capillary beds, costs (labor, equipment, materials), root growth and development, leaf scorch, and pathogens.

Pages